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From: Christoph Hellwig <hch@lst.de>
To: "Maciej W. Rozycki" <macro@linux-mips.org>
Cc: Christoph Hellwig <hch@lst.de>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Fredrik Noring <noring@nocrew.org>,
	linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/6] MIPS: remove cpu_has_64bit_gp_regs and cpu_has_64bit_addresses
Date: Wed, 25 Mar 2020 09:30:12 +0100	[thread overview]
Message-ID: <20200325083012.GA21605@lst.de> (raw)
In-Reply-To: <alpine.LFD.2.21.2003250226450.2689954@eddie.linux-mips.org>

On Wed, Mar 25, 2020 at 02:36:57AM +0000, Maciej W. Rozycki wrote:
> On Tue, 24 Mar 2020, Christoph Hellwig wrote:
> 
> > Both macros are always identical to CONFIG_64BIT.
> 
>  I think this abstraction makes sense, especially if we want to support 
> 64-bit CPUs that only support 32-bit segments, i.e. MIPS architecture 
> processors whose CP0.Config.AT=1, or legacy MIPS processors that had a 
> similar limitation, such as the R5900 currently under review.

The only use of cpu_has_64bit_addresses is the choice of the ioremap
code base.  Which ioremap code does the R5900 want to use?  If it
doesn't match CONFIG_64BIT having a config option for the ioremap
implementation seems much more sensible, and can be added with the
R5900 patch set (do you have a link to it?).

  reply	other threads:[~2020-03-25  8:30 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-24 16:15 MIPS ioremap cleanups Christoph Hellwig
2020-03-24 16:15 ` [PATCH 1/6] MIPS: remove cpu_has_64bit_gp_regs and cpu_has_64bit_addresses Christoph Hellwig
2020-03-25  2:36   ` Maciej W. Rozycki
2020-03-25  8:30     ` Christoph Hellwig [this message]
2020-03-25  8:55       ` Fredrik Noring
2020-03-25  8:58         ` Christoph Hellwig
2020-03-25  9:24           ` Fredrik Noring
2020-03-25  9:54             ` Christoph Hellwig
2020-03-25 11:04               ` Fredrik Noring
2020-03-24 16:15 ` [PATCH 2/6] MIPS: cleanup fixup_bigphys_addr handling Christoph Hellwig
2020-03-24 16:15 ` [PATCH 3/6] MIPS: merge __ioremap_mode into ioremap_prot Christoph Hellwig
2020-03-24 16:15 ` [PATCH 4/6] MIPS: split out the 64-bit ioremap implementation Christoph Hellwig
2020-03-24 16:15 ` [PATCH 5/6] MIPS: move ioremap_prot und iounmap out of line Christoph Hellwig
2020-03-24 16:15 ` [PATCH 6/6] MIPS: use ioremap_page_range Christoph Hellwig

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